KR20190015688A - Display apparatus - Google Patents

Abstract

Provided is a display apparatus which includes a substrate, a driving layer, and a display device layer. The driving layer is arranged on the substrate and comprises first driving circuit groups which respectively include N number of first pixel driving circuits and photo pixels. N is a natural number. The display device layer is arranged on the driving layer and comprises first display device groups which respectively include N number of first display devices electrically connected to each of N number of the first pixel driving circuits. Minimum distances between first color display elements of the plurality of first display elements measured in a first specific direction on a plane may be substantially same. A distance between two first pixel driving circuits adjacent to each other in a second specific direction with a photo-pixel interposed therebetween may be different from a distance between two first pixel driving circuits continuously arranged in the second specific direction.

Description

DISPLAY APPARATUS

The present invention relates to a display device, and more particularly, to a display device having a light sensing area.

Recently, display devices have implemented a function for sensing a fingerprint of a user in a display device. Examples of the fingerprint recognition system include an electrostatic capacity type based on a change in capacitance of a capacitor formed between electrodes, an optical type using an optical sensor, and an ultrasonic type using a piezoelectric body.

In an optical system using an optical sensor, an optical sensor of a separate module type is mounted in a display device to raise the cost, and the sensitivity does not become a level enough to sense the user's fingerprint.

An object of the present invention is to provide a display device having a photo pixel embedded in a driving layer of a display panel and having improved sensing sensitivity.

The present invention is intended to provide a display device capable of keeping the resolution within the display area constant regardless of the region, without changing the arrangement structure of the display elements even if they include the photo pixel regions in the optical sensing region.

A display device according to an embodiment of the present invention includes a substrate, a driving layer, and a display element layer.

Wherein the driving layer is disposed on the substrate and includes first driving circuit groups each including N first pixel driving circuits and photo pixels, wherein N is a natural number, And a photosensor electrically connected to the photo-driving circuit.

The display element layer includes first display element groups disposed on the driving layer and including N first display elements each electrically connected to each of the N first pixel drive circuits.

The minimum distances between the first color display elements of the plurality of first display elements measured in the first specific direction on the plane may be substantially the same.

The distance between the two first pixel drive circuits adjacent to each other in the second specific direction with the photo-pixel interposed therebetween is different from the distance between the two first pixel drive circuits continuously arranged in the second specific direction can do.

The driving layer may further include second driving circuit groups each including the N second pixel driving circuits.

The display element layer may further include second display element groups each including N second display elements electrically connected to each of the N second pixel drive circuits.

The minimum distances between the first color display elements of the plurality of second display elements measured in the first specific direction on the plane may be substantially the same.

The distances between two adjacent second pixel-drive circuits measured in the second specific direction on the plane may be substantially the same.

The display device may define a display area for displaying an image and a non-display area adjacent to the display area. The display area may include a normal display area and a light sensing area that senses a user's input using the incident light.

The first driving pixel groups and the first display element groups on a plane may be disposed in the light sensing area. And the second driving pixel groups and the second display element groups on a plane may be arranged in the normal display area.

The area occupied by each of the first driving pixel groups and the second driving pixel groups may be substantially equal to each other. The areas occupied by each of the first display element groups and the second display element groups may be substantially equal to each other.

The area occupied by each of the first pixel driving circuits may be smaller than the area occupied by each of the second pixel driving circuits.

The first driving circuit group of the first driving circuit groups and the second driving circuit group of the second driving circuit groups adjacent to the first driving circuit group in the first direction are spaced apart from each other to define a blank area have.

The distance between the first pixel driving circuit of the first driving circuit group and the second pixel driving circuit of the second driving circuit group adjacent to each other in the first direction is included in each of the first driving circuit groups, May be greater than the distance between the two first pixel driving circuits adjacent to each other in the direction of the first pixel driving circuits and the distance between the two second pixel driving circuits included in each of the second driving circuit groups and adjacent to each other in the first direction.

The driving layer may further include signal lines. Some of the signal lines may have a bent shape in the blank area.

Some of the signal lines may be branched in the blank area and electrically connected to the first pixel driving circuits and the photo driving circuit.

Wherein the photo sensor comprises: a lower metal layer disposed on the substrate; an active layer disposed on the lower metal layer; an upper metal layer disposed on the active layer and having an opening exposing a portion of the active layer; An absorption filter covering the opening, and an interference filter disposed on the upper metal layer and covering the opening.

The display element layer may further include a pixel defining layer overlapping the photosensor, and a lens formed on the pixel defining layer, the pixel overlapping the photosensor and made of the same material as the pixel defining layer.

The display device may define a display area for displaying an image and a non-display area adjacent to the display area. Wherein the non-display area includes a first bending area defined outside the one side of the display area in the first direction, a first pad area defined outside the first bending area in the first direction, A second bending region defined outside the other side of the display region, and a second pad region defined outside the second bending region in the first direction.

The substrate may be bent along a bending axis extending in a second direction intersecting the first direction within the first and second bending regions.

The display device according to the embodiment of the present invention may further include a first driving circuit chip and a second driving circuit chip. The first driving circuit chip may provide a signal to the first pixel driving circuits and the photo driving circuit, and may be disposed in the first pad area. The second driving circuit chip receives a signal sensed by the photo pixel and may be disposed in the second pad region.

The display device according to an embodiment of the present invention may further include a flexible printed circuit board connecting the first pad area and the second pad area of the display device to each other.

A display device according to another embodiment of the present invention may include a substrate, a driving layer, and a display element layer.

Wherein the driving layer is disposed on the substrate and includes first driving circuit groups each including a plurality of first pixel driving circuits and photo pixels and second driving circuit groups each including a plurality of second pixel driving circuits Groups.

The display element layer may include a plurality of display elements disposed on the driving layer and electrically connected to the first pixel driving circuits and the second pixel driving furnaces.

The minimum distances between the first color display elements of the plurality of display elements measured in the first specific direction on the plane may be substantially the same.

The first driving circuit group of the first driving circuit groups and the second driving circuit group of the second driving circuit groups adjacent to the first driving circuit group in the first direction may be spaced apart from each other.

A display device according to another embodiment of the present invention may include a first scan line, a second scan line, a sensing line, a photo pixel, and a display device.

The first scan line receives the first scan signal. The second scan line receives a second scan signal different from the first scan signal. The sensing line is insulated from the first and second scan signals.

The display element receives the first and second scan signals from the first and second scan signals and emits light.

The photo-pixel receives the first and second scan signals from the first and second scan signals and supplies a current to the sensing line based on the light reflected by the user out of the light emitted from the display element to provide.

According to the display device according to the embodiment of the present invention, the display device has a photo pixel embedded in the driving layer of the display panel and having improved sensing sensitivity.

According to the display device according to the embodiment of the present invention, even if the photo pixel regions are provided in the optical sensing region, the arrangement structure of the display elements may not be changed. Therefore, the display device can keep the resolution in the display area constant regardless of the area.

1 is a perspective view of a display device according to an embodiment of the present invention.
2 is a plan view showing the display device of Fig.
3 is a side view of the display device of Fig.
4 is a cross-sectional view illustrating a display panel according to an embodiment of the present invention.
5 is a plan view showing a driving layer and a display element layer of a display panel according to an embodiment of the present invention shown in FIG.
Fig. 6 is a view showing the display element layer in Fig. 5. Fig.
Fig. 7 is a view showing the driving layer in Fig. 5. Fig.
FIG. 8A is a conceptual diagram showing one pixel driving circuit of the first unit driving circuit shown in FIG. 7, and FIG. 8B is a conceptual diagram of one pixel driving circuit of the second unit driving circuit shown in FIG.
Fig. 9 is a view showing a driving layer including signal lines in Fig. 5. Fig.
FIG. 10 is a view showing a sectional structure of a display panel cut along the line II 'in FIG. 5.
11 is a cross-sectional view of a display panel according to another embodiment of the present invention.
Fig. 12 is a block diagram showing one pixel, and Fig. 13 is a block diagram showing one photo sensor.
14 is a circuit diagram showing one pixel in Fig.
Figs. 15 to 19 are circuit diagrams showing one photo pixel of Fig. 13 according to the embodiments of the present invention.
FIG. 20 is a waveform diagram of a signal applied to FIG. 19, and FIGS. 21A to 21C are diagrams for explaining a driving mechanism of a photo-pixel per section.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification, when it is mentioned that any element (or region, layer, portion, etc.) is "on", "connected", or "coupled" to another element, Or a third component may be disposed therebetween.

Like reference numerals refer to like elements. Also, in the drawings, thickness, ratio, and dimensions of components are exaggerated for an effective description of the technical content. &Quot; and / or " include all combinations of one or more of which the associated configurations can define.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Also, terms such as " below ", " below ", " above ", " above ", and the like are used to describe the relationship of the configurations shown in the drawings. The terms are described relative to the direction shown in the figure in a relative concept.

It will be understood that terms such as "comprise" or "comprise ", when used in this specification, specify the presence of stated features, integers, , &Quot; an ", " an ", " an "

1 is a perspective view of a display device according to an embodiment of the present invention.

1, a display area DA1 in which an image is displayed on a display surface IS of a display device 1000 and a non-display area NDA1 adjacent to the display area DA1 are defined. A plurality of pixels PX (FIG. 2) may be arranged in the display area DA1. The non-display area NDA1 is an area where no image is displayed. The display surface IS of the display device 1000 is the outermost surface of the display device 1000 and may be a surface that the user views. In FIG. 1, the display area DA1 has a rectangular shape, and the non-display area NDA has a shape that surrounds the display area DA1. However, the present invention is not limited thereto, and the display area DA1 and the non-display area NDA1 may have various shapes.

As shown in Fig. 1, a display surface IS on which an image IM is displayed is parallel to a plane defined by the first direction DR1 and the second direction DR2. The normal direction of the display surface IS, that is, the thickness direction of the display device 1000 is indicated by the third direction DR3. The front surface (or the upper surface) and the back surface (or lower surface) of the respective members are separated by the third direction DR3. However, the directions indicated by the first to third directions DR1, DR2, DR3 can be converted to other directions as relative concepts.

The display apparatus 1000 can sense the touch of the user input in the display area DA1. The display apparatus 1000 may include a touch panel capable of sensing a touch of a user input in the display area DA1.

A light sensing area FPA may be further defined on the display surface IS of the display device 1000. [ The display device 1000 senses light incident on the light sensing area FPA and senses a user's input. The light sensing area (FPA) can measure the heart rate by detecting the minute movement of the user's fingerprint or the user's finger. The display device 1000 may include a photo pixel HX (FIG. 2) disposed in the light sensing area FPA. Details will be described later.

In FIG. 1, the light sensing area FPA is illustratively shown in the display area DA1. However, the present invention is not limited thereto. The light sensing area FPA may be defined in the non-display area NDA1 and overlapping with both the display area DA1 and the non-display area NDA1.

Fig. 2 is a plan view showing the display device of Fig. 1, and Fig. 3 is a side view of the display device of Fig.

2 and 3, the display device 1000 may include a display panel DP, a first driving circuit chip DIC, a second driving circuit chip PIC, and a flexible printed circuit board (FPC) have.

The display panel DP may be a light-emitting display panel, and is not particularly limited. For example, the display panel DP may be an organic light emitting display panel or a Quantum dot light emitting display panel. In the organic light emitting display panel, the light emitting layer includes an organic light emitting material. Quantum dot luminescent display panels include quantum dot and quantum luminescent layers. Hereinafter, the display panel DP is described as an organic light emitting display panel.

The display panel DP may include a display area DA on a plane and a non-display area NDA adjacent to the display area DA. The display panel DP may display an image in the display area DA and may not display an image in the non-display area NDA. The display area DA and the non-display area NDA shown in Fig. 2 correspond to the display area DA1 and the non-display area NDA1 shown in Fig. Note that the display area DA and the non-display area NDA of the display panel DP are not necessarily the same as the display area DA1 and the non-display area NDA1 of the display device 1000, DP). ≪ / RTI >

The display area DA may include a normal display area RDA spaced apart from the light sensing area FPA and the light sensing area FPA. The light sensing area FPA and the normal display area RDA may have different circuit structures. Details will be described later.

The non-display area NDA may include a first bending area BA1, a second bending area BA2, and a first pad area PDA1, and a second pad area PDA2.

The first bending area BA1 is defined as an area across the display panel DP in the first direction DR1 on the plane outside the one side of the display area DA and in the second direction DR2. The first pad area PDA1 is defined on the plane outside the first bending area BA1 in the first direction DR1. The display panel DP may be bent along the first bending axis BX1 extending in the second direction DR2 in the first bending area BA1. The first bending area BA1 is bent from the upper surface DP1 to the lower surface DP2 of the display panel DP in the direction opposite to DR3 so that the first pad area PDA1 of the display panel DP, (DA).

The second bending area BA2 may be an area across the display panel DP in the second direction DR2 from the outside of the other side of the display area DA in the first direction DR1 on the plane. The second pad area PDA2 is defined on the plane outside the second bending area BA2 in the first direction DR1. The display panel DP can be bent along the second bending axis BX2 extending in the second direction DR2 in the second bending area BA2. The first bending area BA1 is bent from the upper surface DP1 to the lower surface DP2 of the display panel DP in the direction opposite to DR3 so that the second pad area PDA2 of the display panel DP, (DA).

The display panel DP may include a pixel PX, a photo pixel HX, a plurality of signal lines, and a scan driving circuit GDC.

The pixel PX is arranged in the display area DA and can display an image. The photo pixel HX is disposed in the light sensing area FPA and receives the reflected light from the user to sense the user's input.

The signal lines may include a scan line SL, a data line DL, a power supply line PL, and a sensing line RX. A plurality of scan lines SL, data lines DL, and power supply lines PL are provided, but they are illustrated one by one in FIG.

The scan line SL, the data line DL, and the power source line PL are connected to the pixel PX. The data line DL and the power supply line PL may be connected to the first driving circuit chip DIC to receive the driving signal.

The photo pixel HX may be connected to the sensing line RX. The photo pixel HX may be connected to the scan line SL and the power supply line PL to which corresponding pixels are connected. Details will be described later. The sensing line RX may be connected to the second driving circuit chip PIC.

The scan driving circuit GDC may be disposed in the non-display area NDA. The scan driving circuit GDC can generate a scan signal and output the generated scan signal to the scan line SL.

The scan driving circuit GDC may include a plurality of thin film transistors formed through the same process as the driving circuit of the pixels PX, for example, a low temperature polycrystalline silicon (LTPS) process or a low temperature polycrystalline oxide (LTPO) process.

The first driving circuit chip DIC may be disposed in the first pad region PDA1. The first driving circuit chip DIC may be directly mounted on the first pad region PDA1 but may be mounted on a flexible printed circuit board (not shown) connected to the first pad region PDA1 have. The first driving circuit chip (DIC) provides a signal necessary for driving the display panel (DP). That is, the first driving circuit chip DIC can provide a signal to the data line DL and the power supply line PL. The first driving circuit chip DIC may be a source driver integrated circuit that provides a data signal to the data line DL.

And the second driving circuit chip PIC may be disposed in the second pad region PDA2. The second driving circuit chip PIC may be directly mounted on the second pad region PDA2 but may be mounted on a flexible printed circuit board (not shown) connected to the second pad region PDA2 have. The second driving circuit chip PIC receives the signal sensed by the photo pixel HX through the sensing line RX and senses the user's input based on the received signal.

The light sensing area FPA is positioned closer to the other end DA22 of the display area DA and the other end DA22 of the display area DA relatively close to the second driving circuit chip PIC in the first direction DR1 Can be defined. Therefore, the second driving circuit chip PIC is disposed in the second pad area PDA2 adjacent to the other end DA22 of the display area DA to reduce the resistance value of the sensing line RX, Which is advantageous for improving the sensitivity of the sensor.

Even if the first and second driving circuit chips DIC and PIC are disposed in the first and second pad areas PDA1 and PDA2 in the embodiment of the present invention, And BA2 are bent and both ends of the display panel DP are bent downward in the first direction DR1 so that the area occupied by the non-display area NDA on the plane can be reduced.

The flexible printed circuit board FPC is connected to the first pad area PDA1 and the second pad area PDA2 of the display panel DP so that the first and second driving circuit chips DIC and PIC exchange signals Provide a path. Although the flexible printed circuit board (FPC) is illustrated as being directly connected to the first pad area PDA1 and the second pad area PDA2 in FIGS. 2 and 3, the flexible printed circuit board FPC) may be connected to the first pad region PDA1 or the second pad region PDA2 via another flexible printed circuit board.

The second driving circuit chip PIC can receive a timing signal, a voltage signal, and the like necessary for driving the photo pixel HX through the flexible printed circuit board (FPC), and outputs the result of sensing through the sensing line RX can do.

The second driving circuit chip PIC may be electrically connected to at least one of the data line DL and the power supply line PL. In FIG. 2, the second driving circuit chip PIC is electrically connected to the power supply line PL. The second driving circuit chip PIC receives a signal to be applied to the power supply line PL through the flexible printed circuit board FPC and outputs a signal required for the power supply line PL together with the first driving circuit chip DIC . Since the display panel DP is implemented in a large area, the length of the wirings passing through the display area DA becomes long, and a luminance lowering problem due to the RC delay difference may occur even in the display area DA. A luminance difference problem that may occur at both ends of the display area DA along the first direction DR1 by applying the same signal to each of the first and second driving circuit chips DIC and PIC at both ends of one of the signal lines Can be improved.

Although not shown, a flexible printed circuit board (FPC) may include a force driving chip. At this time, the display panel may further include a force sensor disposed in the light sensing area FPA. The force driving chip can measure the intensity of the user's input applied to the light sensing area (FPA) based on the signal output from the force sensor.

4 is a cross-sectional view illustrating a display panel according to an embodiment of the present invention.

The display panel DP may include a substrate 100, a driving layer 200, a display element layer 300, and an encapsulating layer 400. The display panel DP may further include a protective member disposed under the substrate 100 and a window member disposed on the sealing layer 400. [ Further, the display panel DP may further include functional layers such as an antireflection layer, a refractive index control layer, and the like.

The substrate 100 may comprise at least one plastic film. The substrate 100 may be a flexible substrate, a plastic substrate, a glass substrate, a metal substrate, or an organic / inorganic composite substrate. The display area DA and the non-display area NDA described with reference to FIG. 2 and FIG. 3 can be equally defined on the substrate SUB.

The driving layer 200 is disposed on the substrate 100. The driving layer 200 includes at least one intermediate insulating layer and circuit elements. The intermediate insulating layer comprises at least one intermediate inorganic film and at least one intermediate organic film. The circuit element includes the signal lines explained in FIG. 2, the scan driving circuit GDC, the pixel driving circuit of the pixel PX, the photosensor of the photo pixel, and the photo-driving circuit of the photo pixel. A detailed description thereof will be described later.

The display element layer 300 is disposed on the driving layer 200. The display element layer 300 includes a display element. In one embodiment of the present invention, the display element may be an organic light emitting diode. The display element layer 300 may further include an organic film such as a pixel defining film.

The sealing layer 400 seals the display element layer 300. The sealing layer 400 includes at least one inorganic film (hereinafter referred to as an encapsulating inorganic film). The sealing layer 400 may further include at least one organic film (hereinafter, an encapsulating organic film). The encapsulating inorganic film protects the display element layer 300 from moisture / oxygen, and the encapsulating organic film protects the display element layer 300 from foreign substances such as dust particles. The encapsulating inorganic film may include a silicon nitride layer, a silicon oxynitride layer and a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. The encapsulating organic film may include, but is not limited to, an acrylic based organic layer.

The display panel DP may further include a touch sensing unit TS disposed on the sealing layer 400. [ The touch sensing unit TS acquires the coordinate information of the external input. The touch sensing unit TS may be disposed directly on the sealing layer 400. [ As used herein, the term " directly disposed " means that it is formed by a continuous process except that it is adhered using a separate adhesive layer. However, the present invention is not limited thereto, and the touch sensing unit TS may be attached to the sealing layer 400 through an adhesive as a separate independent module.

The touch sensing unit (TS) may have a multi-layer structure. The touch sensing unit TS may comprise a single layer or a multilayer conductive layer. The touch sensing unit TS may comprise a single layer or multilayer insulating layer.

The touch sensing unit TS can sense an external input, for example, in a capacitive manner. In the present invention, the operation of the touch sensing unit TS is not particularly limited. In an embodiment of the present invention, the touch sensing unit TS may sense an external input through electromagnetic induction or pressure sensing.

FIG. 5 is a plan view showing a driving layer and a display element layer of a display panel according to an embodiment of the present invention shown in FIG. 2, FIG. 6 is a view showing a display element layer in FIG. 5, Fig. 5 to 7 are enlarged views of a partial area AA of the display panel DP shown in Fig.

Hereinafter, the distance between the display elements means the distance between the centers of the display elements.

4 to 6, the display element layer 300 includes first display element groups UP1 and UP2 arranged in the light sensing area FPA and second display element groups UP1 and UP2 arranged in the normal display area RDA. Groups UP3 and UP4.

Each of the first display element groups UP1 and UP2 may be the minimum display elements repeatedly arranged in the light sensing area FPA. In FIG. 6, the first two display elements UP1 and UP2 are the same, and the first display element group UP1 will be described below.

The first display element group UP1 may include N display elements OD. N can be a natural number and can be set in various ways. The display elements arranged in the first display element group UP1 may be defined as first display elements. In the embodiment of the present invention, the first display element group UP1 includes two red display elements XR1 and XR2, two blue display elements XB1 and XB2, and four green display elements XG1 to XG4 ). ≪ / RTI > The green display elements XG1 to XG4 have smaller areas than the red display elements XR1 and XR2 and the blue display elements XB1 and XB2 respectively and the number of the green display elements XG1 to XG4 is red Is larger than the number of the elements XR1 and XR2 and larger than the number of the blue display elements XB1 and XB2. In one embodiment of the present invention, the number of green display elements XG1 to XG4 is set to be smaller than the number of red display elements XR1, XR2 and XR4 because the human eye has a relatively high perceived resolution with respect to green, The blue display elements XB1 and XB2 are provided in a relatively large amount so that the green resolution can be improved.

However, the present invention is not limited thereto, and the number of display elements included in the first display element group UP1, the color ratio of the display elements, and the like can be variously adjusted.

The pixel areas HA1 to HA4 may be defined in the display element layer 300. [ The photo pixel regions HA1 and HA2 may be regions where the photo sensors PD1 to PD4 (FIG. 7) are disposed.

The photo pixel regions HA1 to HA4 may be defined between the display elements OD on a plane. 6, for example, the photo pixel area HA1 includes a red display element XR2, a blue display element XB1, and two adjacent green display elements XG4 and XG7. Can be defined within the region surrounded by the < RTI ID = 0.0 > The number and position of the photo pixel regions HA1 to HA4 may be variously defined.

Each of the second display element groups UP3 and UP4 may be the minimum display elements repeatedly arranged in the normal display area RDA. In FIG. 6, the same two second display element groups UP3 and UP4 are shown, and one second display element group UP3 will be described below.

And the second display element group UP3 may include N display elements OD. The second display element group UP3 may have substantially the same structure as the first display element group UP1. And the display elements disposed in the second display element group UP3 may be defined as the second display elements. In the embodiment of the present invention, the second display element group UP3 includes two red display elements XR5 and XR6, two blue display elements XB5 and XB6, and four green display elements XG9 to XG12 ). ≪ / RTI > No photo pixel region is defined between the display elements OD of the second display element group UP3.

The first display element group UP1 and the second display element group UP3 have the same arrangement structure of the display elements OD. That is, the minimum distances between specific color display elements adjacent to each other in a specific direction or a direction orthogonal to the specific direction may be substantially the same.

For example, the distance DT1 between the two red display elements XR3 and XR4 of the first display element group UP2 in the fourth direction DR4 is set to a distance between the red display elements XR3 and XR4 in the fifth direction DR5 can be substantially equal to the distance DT2 between the red display element XR3 of the first display element group UP2 and the red display element XR8 of the second display element group UP4. Likewise, the distance DT3 between the two green display elements XG1 and XG2 of the first display element group UP1 in the second direction DR2 is smaller than the distance DR3 in the first direction DR1 orthogonal to the second direction DR2. May be substantially equal to the distance DT4 between the green display element XG1 of the first display element group UP1 and the green display element XG11 of the second display element group UP3.

According to an embodiment of the present invention, even if the photo pixel areas HA1 to HA4 are provided in the light sensing area FPA, the arrangement structure of the display elements is not changed, The resolution can be kept constant.

FIG. 8A is a conceptual diagram showing one pixel driving circuit of the first unit driving circuit shown in FIG. 7, and FIG. 8B is a conceptual diagram of one pixel driving circuit of the second unit driving circuit shown in FIG.

Hereinafter, the distance between the pixel driving circuits means a distance between the centers of the areas occupied by each of the pixel driving circuits.

Referring to FIGS. 4, 5, 7, 8a and 8b, the driving layer 200 includes first driving circuit groups UC1 and UC2 arranged in the light sensing area FPA, And second driving circuit groups UC3 and UC4.

Each of the first driving circuit groups UC1 and UC2 may be a minimum unit circuit repeatedly arranged in the light sensing area FPA. In FIG. 7, two identical first driving circuit groups UC1 and UC2 are shown, and the following description will be made with reference to the first driving circuit group UC1.

The first driving circuit group UC1 includes the circuits for driving the first display element group UP1 and the picture pixels HX1 and HX2. One first driving circuit group UC1 includes N pixel driving circuits CK1 through CK8. The photo pixels HX1 and HX2 may include photo-drive circuits PK1 and PK2 and photosensors PD1 and PD2.

N may be a natural number and the number of the pixel driving circuits CK1 to CK8 may be changed according to the arrangement structure of the pixels PX provided in the first display element group UP1. In one embodiment of the present invention, the display elements PX have a structure in which eight display elements (two red display elements, two blue display elements, and four green display elements) are repeatedly arranged, The number of the pixel driving circuits CK1 to CK8 may be eight.

The pixel driving circuits CK1 to CK8 of the first driving circuit group UC1 may include transistors and capacitors for driving the corresponding display elements OD of the first display element group UP1. A specific circuit of the pixel drive circuits CK1 to CK8 will be described later.

The photosensors PD1 and PD2 are disposed so as to overlap with the photo-pixel areas HA1 and HA2 shown in Fig. The number and position of the photo-pixel regions HA1 and HA2 in Fig. 6 are determined according to the number and position of the photo pixels HX1 and HX2.

The photo-drive circuits PK1 and PK2 may include transistors and capacitors for driving the photosensors PD1 and PD2. Specific circuits of the photo-drive circuits PK1 and PK2 will be described later.

Each of the second driving circuit groups UC3 and UC4 may be a minimum unit circuit repeatedly arranged in the normal display area RDA. In FIG. 7, the same two second driving circuit groups UC3 and UC4 are shown and the second driving circuit group UC3 will be described below.

The second driving circuit group UC3 includes circuits for driving the second display element group UP3. The second driving circuit group UC3 may include N pixel driving circuits CK17 to CK24. The pixel driving circuits CK17 to CK24 of the second driving circuit group UC3 may include transistors and capacitors for driving the corresponding display elements of the second display element group UP3.

The areas occupied by the first driving circuit group UC1 and the second driving circuit group UC3 may be substantially equal to each other. The number of pixel driving circuits arranged in each of the first driving circuit group UC1 and the second driving circuit group UC3 is the same and the photo driving circuits PK1 and PK2 are further arranged in the first driving circuit group UC1 do. The area occupied by each of the pixel driving circuits CK1 to CK8 of the first driving circuit group UC1 may be smaller than the area occupied by each of the pixel driving circuits CK17 to CK24 of the second driving circuit group UC3 have. At this time, the area occupied by each of the pixel driving circuits CK1 to CK8 in the first driving circuit group UC1 may be equal to each other, and the pixel driving circuits CK17 to CK24 in the second driving circuit group UC3 ) May occupy the same area. However, the present invention is not limited thereto.

In one embodiment of the present invention, the width DT5 of the area occupied by one pixel driving circuit CK1 of the first driving circuit group UC1 in the second direction DR2 is the second width DR2 in the second direction DR2, May be smaller than the width DT6 of the area occupied by one pixel driving circuit CK21 of the driving circuit group UC3. The width DT7 of the area occupied by one pixel driving circuit CK1 of the first driving circuit group UC1 in the first direction DR1 and the width DT7 of one area of the second driving circuit group UC3 in the first direction DR1 The width DT7 of the area occupied by the pixel driving circuit CK21 of the pixel driving circuit CK21 may be equal to each other. If the area occupied by the pixel driving circuit CK1 of the first driving circuit group UC1 is smaller than the area occupied by the pixel driving circuit CK21 of the second driving circuit group UC3, The shape of the pixel drive circuit CK1 of the first drive circuit group UC1 can be variously changed.

The distance between two pixel driving circuits adjacent to each other in a specific direction with the picture pixels HX1 and HX2 therebetween may be different from the distance between two pixel driving circuits arranged continuously in a specific direction. For example, the photo pixel HX1 is arranged between the pixel drive circuit CK4 of the first drive circuit group UC1 and the pixel drive circuit CK9 of the first drive circuit group UC4 in the second direction DR2 . The pixel driving circuits CK3 and CK4 of the first driving circuit group UC1 are continuously arranged in the second direction DR2. The distance DT9 between the pixel drive circuits CK4 and CK9 in the second direction DR2 may be larger than the distance DT10 between the pixel drive circuits CK3 and CK4 in the second direction DR2.

The pixel drive circuits CK1 to CK8 of the first drive circuit group UC1 are connected to the display elements XG1 to XG4, XR1, XR2, XB1 and XB2 of the corresponding first display element group UP1, Holes CH1. The pixel drive circuits CK17 to CK24 of the second drive circuit group UC3 are connected to the display elements XG9 to XG12, XR5, XR6, XB5, and XB6 of the corresponding second display element group UP3, 2 contact holes CH2. The distance DT11 between the first contact holes CH1 in the second direction DR2 may be smaller than the distance DT12 between the second contact holes CH2 in the second direction DR2. Even if the distance between the first contact holes CH1 becomes smaller than the distance between the second contact holes, the pixel driving circuits CK1 through CK8 of the first driving circuit group UC1 and the pixel driving circuits CK1 through CK8 of the first display element group The display elements XG1 to XG4, XR1, XR2, XB1, and XB2 of the display unit UP1 do not affect the connection. That is, the positions of the first contact holes CH1 can be partially changed while the display elements of the first and second display element groups UP1 to UP4 are regularly arranged.

The distance between the first contact holes CH1 in the first direction DR1 and the distance between the second contact holes CH2 in the first direction DR1 and the distance between the first contact holes CH1 in the first direction DR1, The distance between the first contact hole CH1 and the second contact hole CH2 may be the same.

The first driving circuit group UC1 and the second driving circuit group UC3 may be spaced apart in the first direction DR1. An area between the first driving circuit group UC1 and the second driving circuit group UC3 in the first direction DR1 may be defined as a blank area VA. The pixel drive circuits CK1 to CK32 and the photo pixels HX1 to HX4 are not arranged in the blank area VA of the driving layer 200. [ The blank area VA may be defined to traverse the display area DA of the display panel DP along the second direction DR2.

The pixel drive circuit CK1 of the first drive circuit group UC1 and the pixel drive circuit CK21 of the second drive circuit group UC3 can have an inverted shape with respect to an axis extending in the second direction DR2 have. The positions of the first contact hole CH1 and the second contact hole CH2 in the pixel drive circuit CK1 of the first drive circuit group UC1 and the pixel drive circuit CK21 of the second drive circuit group UC3, It is possible to secure the blank area VA while maintaining the distance between the first contact hole CH1 and the second contact hole CH2 in the first direction DR1.

The distance DT13 between the pixel drive circuit CK1 of the first drive circuit group UC1 and the pixel drive circuit CK21 of the second drive circuit group UC3 adjacent to each other in the first direction DR1 corresponds to the distance The distance DT14 between the two pixel driving circuits CK1 and CK5 included in each of the driving circuit groups UC1 and adjacent to each other in the first direction DR1 and the second driving circuit groups UC3 And is larger than the distance between the two second pixel-driving circuits CK17 and CK21 adjacent to each other in the first direction DR1.

8A and 8B, the pixel drive circuit CK21 of the second drive circuit group UC3 and the pixel drive circuit CK1 of the first drive circuit group UC1 corresponding thereto are shown. And a part CKP1 of the circuit arranged on the plane in the pixel drive circuit CK21 has an "L" shape. The portion CKP2 of the circuit arranged in the pixel driving circuit CK1 is illustratively shown to have an inverted " L " shape. However, since the width of the pixel drive circuit CK1 in the second direction DR2 is smaller than the width of the pixel drive circuit CK21, a part of the circuit arranged in the pixel drive circuit CK1 in the first direction DR1 CKP2 is smaller than the width of a portion CKP1 of the circuit arranged in the pixel driving circuit CK21.

Fig. 9 is a view showing a driving layer including signal lines in Fig. 5. Fig. FIG. 9 is an enlarged view of a partial area AA of the display panel DP shown in FIG.

4, 5, 7 and 9, the signal lines of the driving layer 200 are connected to the scan lines SL1 to SL4, the data lines DL1 to DL8, the power lines PL1 to PL8, The light emitting lines ML1 to ML4, and the sensing lines RX1 and RX2. The specific function of each signal line will be described later.

The transistors and the capacitors provided in each of the pixel driving circuits CK1 to CK32 may be at least one of the scanning lines SL1 to SL4 and at least one of the data lines DL1 to DL8, At least one of the initialization lines IL1 to IL4, and at least one of the light emission lines ML1 to ML4.

The transistors and the capacitors included in each of the photo-driving circuits PK1 to PK4 may be connected to at least one of the sensing lines RX1 and RX2.

The width of the pixel drive circuits CK1 to CK16 arranged in the first drive circuit groups UC1 and UC2 in the second direction DR2 and the width of the second drive circuit groups UC3 and UC4 The widths of the pixel driving circuits CK17 to CK32 are different. Therefore, generally, the signal lines, for example, the power supply lines PL1 to PL8 and the data lines DL1 to DL8 extending in the first direction DR1 are connected to the first driving circuit groups UC1, UC2 and the second driving circuit groups UC3 and UC4, as shown in FIG.

For example, the power supply line PL2 extends in the first direction DR1 until it passes the second driving circuit group UC3, and the second driving circuit group UC3 extends in the first direction DR1, Immediately after passing through the first driving circuit group UC1 and then bent in the first direction DR1 and passes the first driving circuit group UC1. This type of wiring is not easy to design, resulting in deterioration of display quality.

In the embodiment of the present invention, by securing the blank area VA, some of the signal lines between the first and second driving circuit groups UC1 and UC3 can easily change the extending direction.

Also, some of the signal lines, for example, the power supply lines PL4 and PL8 may be connected to the transistors of the photo-driving circuits PK1 to PK4. The power supply line PL4 is branched in the blank area VA and connected to the pixel drive circuits CK3 and CK7 of the first drive circuit group UC1 and the photoelectric conversion circuit PK1 to PK2).

The driving layer 200 may further include dummy scanning lines SLd1 and SLd2. The dummy scan lines SLd1 and SLd2 may be connected to the pixel drive circuit of the second drive circuit group UC2 to provide a signal for initializing the pixel drive circuit of the second drive circuit group UC2. The dummy scan lines SLd1 and SLd2 may be disposed in the blank region VA.

FIG. 10 is a view showing a cross-sectional structure of a display panel cut along a line I-I 'in FIG.

Referring to FIGS. 7 and 10, the photo-driving circuits PK1 to PK4 of the driving layer 200 may include phototransistors. The photo-driving circuits PK1 through PK4 may include a plurality of phototransistors, but one phototransistor TRP connected to the photosensor PD in FIG. 10 is exemplarily shown.

The pixel driving circuits CK1 to CK32 of the driving layer 200 may include pixel transistors and one pixel transistor TRX connected to the first electrode EL1 of the display element OD in Fig. Respectively.

A buffer layer 201 may be disposed on the substrate 100 to block the penetration of impurities. The buffer layer 201 may be formed of an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or may be formed of an organic material such as polyimide, polyester, acrylic, Or a stack of a plurality of materials selected from among the plurality of materials.

The phototransistor TRP of the photo-drive circuit PK includes an active layer 211, a gate electrode 213, a source electrode 215, and a drain electrode 217.

The active layer 211 may be disposed on the buffer layer 201. The driving layer 200 may further include a first insulating layer 221 disposed between the active layer 211 and the gate electrode 213. The first insulating film 221 can isolate the active layer 211 and the gate electrode 213 from each other. The source electrode 215 and the drain electrode 217 may be disposed on the gate electrode 213. The driving layer 200 may further include a second insulating layer 223 disposed between the gate electrode 213 and the source electrode 215 and between the gate electrode 213 and the drain electrode 217. The source electrode 215 and the drain electrode 217 may be connected to the active layer 211 through the contact hole CT1 provided in the first insulating layer 221 and the second insulating layer 223, respectively.

The structure of the phototransistor TRP is not limited to the structure shown in Fig. 10, and the positions of the active layer 211, the gate electrode 213, the source electrode 215, and the drain electrode 217 may be varied . For example, in FIG. 10, the gate electrode 213 may be disposed under the active layer 211.

The photosensor PD may include a lower metal layer 240, an upper metal layer 250, a first active layer 231, a second active layer 235, and a third active layer 233.

The bottom metal layer 240 may comprise a metallic material. The lower metal layer 240 may block light incident on the first to third active layers 231, 233, and 235. The lower metal layer 240 may be connected to the drain electrode 217 of the phototransistor TRP. The bottom metal layer 240 may be an anode or a cathode.

The upper metal layer 250 may cover the edges of the photosensor PD to block light incident on the edges of the first to third active layers 231, 233, and 235. The upper metal layer 250 has an opening OP exposing a portion of the second active layer 235 corresponding to the center of the first to third active layers 231, 233, and 235 to form the first to third active layers 231, And provides a path through which light is incident. The upper metal layer 250 may be a cathode when the first electrode 231 is an anode, or an anode when the first electrode 231 is a cathode. The upper metal layer 250 may be connected to any one of the signal lines to receive a signal provided from the connected signal line.

The lower metal layer 240 and the upper metal layer 250 are not absorbed by the first to third active layers 231, 233, and 235 and reflect the reflected light to the inside to increase the light absorption rate of the first to third active layers 231, 233, and 235 . Therefore, the sensing sensitivity of the photosensor PD can be improved by the lower metal layer 240 and the upper metal layer 250.

The first active layer 231 may be disposed on the lower metal layer 240 and may contact the lower metal layer 240.

The second active layer 235 is disposed under the upper metal layer 250 and may contact the upper metal layer 250. The second active layer 235 may be connected to the upper metal layer 250 through a contact hole formed in the second insulating layer 223.

The third active layer 233 is disposed between the first active layer 231 and the second active layer 235. The third active layer 233 may be an intrinsic semiconductor.

Depending on whether the lower metal layer 240 and the upper metal layer 250 function as an anode or a cathode, the first active layer 231 and the second active layer 235 may be a P-type semiconductor or an N-type semiconductor sequentially It could be the opposite. The third active layer 233 may be an intrinsic semiconductor.

When light is incident on the photosensor PD, holes and electrons are generated in the third active layer 233, and a current is generated by these movements. The photoelectric driving circuit PK senses the current flowing to the lower metal layer 240 of the photosensor PD and senses the input of the user applied to the photo pixel region HA. The light source of the photosensor (PD) for sensing the user's input may be a display device (OD) adjacent to the adjacent photosensor (PD). A part of the light emitted from the display element OD may be reflected by the user's finger or the like overlapping the photo pixel area HA and incident on the photosensor PD.

The photosensor PD may further include an absorption filter 260 and an interference filter 270.

The absorption filter 260 is disposed on the upper metal layer 250 and covers the opening OP provided in the upper metal layer 250. The absorption filter 260 can selectively absorb light of a specific wavelength. The transmission band of the absorption filter 260 may overlap the emission band of the display element OLD. The absorption filter 260 may improve the sensitivity of the photosensor PD by removing noise due to external light except for the display element OLD.

The interference filter 270 may be disposed on the absorption filter 260. The interference filter 270 may selectively transmit light incident at a specific range of angles. Light of various angles can be incident on the photosensor PD. As the angle of the incident light is varied, the resolution for user input is reduced. The photosensor PD can receive a limited range of angles only through the interference filter 270 to more accurately sense the user's input.

The positions of the absorption filter 260 and the interference filter 270 may be changed with each other, and at least one filter may be omitted in some cases.

The pixel transistor TRX includes an active layer 281, a gate electrode 283, a source electrode 285, and a drain electrode 287.

The active layer 281, the gate electrode 283, the source electrode 285 and the drain electrode 287 of the pixel transistor TRX are substantially the same as the respective constitutions of the phototransistor TRP in the embodiment of the present invention Therefore, detailed description thereof will be omitted. However, the present invention is not limited thereto, and the positions of the respective constitutions of the pixel transistor TRX and the phototransistor TRP may be different from each other.

The driving layer 200 may further include a third insulating layer 225. The third insulating film 225 is disposed on the source electrode 215 and the drain electrode 217 of the phototransistor TRP and is disposed on the source electrode 285 and the drain electrode 287 of the pixel transistor TRX . The third insulating film 225 may be disposed on the absorption filter 260 and the interference filter 270.

The display element layer 300 may include a display element OD and a pixel defining layer (PDL).

The pixel defining layer (PDL) is disposed on the third insulating film 225. The pixel definition film (PDL) may be arranged to overlap with the photosensor PD. The pixel defining layer PDL may be disposed so as to partially overlap with the first electrode EL1 of the display element OD.

The display element OD may be an organic light emitting element. The display element OD may include a first electrode EL1, an organic layer OL, and a second electrode EL2.

The first electrode EL1 is disposed on the third insulating film 225. [ The first electrode EL1 is connected to the drain electrode 287 of the pixel transistor TRX through the contact hole CT2 formed in the third insulating film 225. [

The first electrode EL1 may be a pixel electrode or an anode. The first electrode EL1 may be a transmissive electrode, a transflective electrode, or a reflective electrode. When the first electrode EL1 is a transmissive electrode, the first electrode EL1 is formed of a transparent metal oxide such as ITO (indium tin oxide), IZO (indium zinc oxide), ZnO (zinc oxide), ITZO tin zinc oxide, and the like. When the first electrode EL1 is a transflective electrode or a reflective electrode, the first electrode may include a mixture of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or a metal.

The first electrode EL1 may be a multilayer structure having a single layer or a plurality of layers made of a transparent metal oxide or a metal. For example, the first electrode EL1 may be a single layer structure of ITO, Ag or a mixture of metals (for example, a mixture of Ag and Mg), a two-layer structure of ITO / Mg or ITO / But it is not limited thereto.

The organic layer OL may include an organic emission layer (EML) composed of a low-molecular organic material or a polymer organic material. The organic light emitting layer can emit light. The organic layer OL may include a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), and an electron injection layer (EIL) And the like.

 And the second electrode EL2 may be provided on the organic layer OL. The second electrode EL2 may be a common electrode or a cathode. The second electrode EL2 may be a transmissive electrode, a transflective electrode, or a reflective electrode. In the case where the second electrode EL2 is a transmissive electrode, the second electrode CE may be formed of any of Li, Liq, Ca, LiF / Ca, LiF / Al, Al, Mg, BaF, For example, a mixture of Ag and Mg).

In the case where the second electrode EL2 is a transflective electrode or a reflective electrode, the second electrode EL2 may be formed of Ag, Liq, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, LiF / Ca, LiF / Al, Mo, Ti, or a compound or mixture thereof (for example, a mixture of Ag and Mg). Or a transparent conductive film formed of a reflective film or a semi-transmissive film formed of the above material and indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide Lt; / RTI >

The second electrode EL2 may include an auxiliary electrode. The auxiliary electrode includes a film formed by depositing the material so as to face the light emitting layer, and a transparent metal oxide such as ITO (indium tin oxide), IZO (indium zinc oxide), ZnO (zinc oxide), ITZO indium tin zinc oxide), and may include Mo, Ti, Ag, and the like.

When the display device OD is a top emission type, the first electrode EL1 may be a reflective electrode and the second electrode EL2 may be a transmissive electrode or a transflective electrode. When the display element OD is of a back light emission type, the first electrode EL1 may be a transmissive electrode or a transflective electrode, and the second electrode EL2 may be a reflective electrode.

The display element layer 300 may further include a lens LZ. The lens LZ is disposed in the photo pixel area HA and may be arranged to overlap with the photosensor PD. The lens LZ may be disposed on the pixel defining layer PDL. The lens LZ may be made of the same material as the pixel defining layer PDL and may be formed in the same step. Specifically, the lens LZ may be formed using a multi-tone mask when forming a pixel defining layer (PDL) in the photo pixel region HA. Therefore, the lens LZ may be made of the same material as the pixel defining layer PDL.

The lens LZ is not disposed on the pixel defining layer PDL between the display elements OLD disposed in the normal display area RDA. The lens LZ functions as a convex lens and focuses the light incident on the lens LZ by the user out of the light emitted from the display element OLD to the photosensor PD. Therefore, the sensing sensitivity of the photosensor PD can be improved by the lens LZ.

The sealing layer 400 may be disposed on the second electrode EL2.

11 is a cross-sectional view of a display panel according to another embodiment of the present invention.

The display panel DP-1 shown in Fig. 11 is substantially similar except that it further includes an adjustment layer 280 as compared with the display panel DP described with reference to Fig. Hereinafter, substantially the same constituent elements among the constitutions of FIGS. 10 and 11 are denoted by the same reference numerals, and explanation will be made with reference to the controlling layer 280. FIG.

The driving layer 200 may further include an adjusting layer 280.

The control layer 280 may be disposed below the lower metal layer 240. The adjustment layer 280 may be disposed on the same layer as the active layer 211 of the phototransistor TRP.

The control layer 280 may block the light incident on the first to third active layers 231, 233 and 235 together with the lower metal layer 240 to improve the sensing sensitivity of the photosensor PD '. The adjustment layer 280 increases the position of the photosensor PD in the third direction DR3 which is the thickness direction of the display panel DP-1 so that light reflected by the user is reflected on the photosensor PD The arriving optical path can be shortened, and as a result, the sensing sensitivity of the photosensor PD 'can be improved. In addition, since the adjustment layer 280 and the lower metal layer 240 form a capacitor and use the formed capacitor in the photo-driving circuit, the space for forming the capacitor on the plane can be omitted, Can be improved.

Although the control layer 280 is shown as one in FIG. 11, in another embodiment, a plurality of control layers may be formed using a layer below the lower metal layer 240.

Fig. 12 is a block diagram showing one pixel, and Fig. 13 is a block diagram showing one photo sensor.

10 and 12, in the embodiment of the present invention, the pixel PX is electrically connected to the pixel driving circuit and the pixel driving circuit included in the driving layer 200 of the display panel DP, 300 may include a display device OD included in the display device.

The pixel PX receives the power supply voltage ELVDD, the scanning signal Sn, the data signal Dm, the initialization voltage Vint and the emission control signal En and emits light from the display element.

10 and 13, in the embodiment of the present invention, the photo pixel HX includes a photosensor PD electrically connected to the photo-drive circuit and the photo-drive circuit included in the drive layer 200 of the display panel DP ).

13, the photo pixel HX receives the power supply voltage ELVDD, the scan signal Sn, the initialization voltage Vint, and the light reflected by the user, and outputs the sensing signal Rn ).

The photo pixel HX can receive the power supply voltage ELVDD, the scan signal Sn, and the initialization voltage Vint applied to the corresponding pixel PX. The photo pixel HX shares the signal line with the pixel PX and outputs the sensing signal Rn using the signal applied to the pixel PX to simplify the design of the photo driving circuit.

14 is a circuit diagram showing one pixel in Fig.

One pixel PX according to an embodiment of the present invention may include a plurality of transistors T1 to T7, a storage capacitor Cst, and an organic light emitting diode (OLED).

The thin film transistors T1 to T7 include a driving transistor T1, a switching transistor T2, a compensation transistor T3, an initialization transistor T4, a first emission control transistor T5, a second emission control transistor T6, , And a bypass transistor T7.

The pixel PX includes a first scan line 14 for transmitting an n-th scan signal Sn to the switching transistor T2 and the compensating transistor T3, an n-1th scan signal Sn- 1), a third scan line 34 for transferring the (n + 1) th scan signal Sn + 1 to the bypass transistor T7, a first emission control transistor T5, A data line 16 for transferring the data signal Dm, and a power line (not shown) for transmitting the power source voltage ELVDD to the first emission control transistor T6 and the second emission control transistor T6. 26 and an initialization line 22 for transferring an initialization voltage Vint for initializing the driving transistor Tl.

The gate electrode G1 of the driving transistor T1 is connected to the first electrode C1 of the storage capacitor Cst. The source electrode S1 of the driving transistor T1 is connected to the power supply line 26 via the first emission control transistor T5. The drain electrode D1 of the driving transistor T1 is electrically connected to the anode of the organic light emitting diode OLED via the second emission control transistor T6. The driving transistor Tl receives the data signal Dm in accordance with the switching operation of the switching transistor T2 and supplies the driving current Id to the organic light emitting diode OLED.

The gate electrode G2 of the switching transistor T2 is connected to the first scan line 14. [ The source electrode S2 of the switching transistor T2 is connected to the data line 16. The drain electrode D2 of the switching transistor T2 is connected to the source electrode S1 of the driving transistor T1 and is connected to the power source line 26 via the first emission control transistor T5. The switching transistor T2 is turned on in response to the first scan signal Sn received through the first scan line 14 and supplies the data signal Dm transferred to the data line 16 to the source To the electrode (S1).

The gate electrode G3 of the compensating transistor T3 is connected to the first scanning line 14. [ The source electrode S3 of the compensation transistor T3 is connected to the drain electrode D1 of the driving transistor T1 and is connected to the anode of the organic light emitting diode OLED via the second emission control transistor T6. The drain electrode D3 of the compensating transistor T3 is connected to the first electrode C1 of the storage capacitor Cst and the source electrode S4 of the initializing transistor T4 and the gate electrode G1 of the driving transistor Tl . The compensating transistor T3 is turned on according to the nth scanning signal Sn transmitted through the first scanning line 14 to connect the gate electrode G1 and the drain electrode D1 of the driving transistor T1 to each other Thereby diode-connecting the driving transistor Tl.

And the gate electrode G4 of the initializing transistor T4 is connected to the second scanning line 24. [ The drain electrode D4 of the initializing transistor T4 is connected to the initialization line 22. The source electrode S4 of the initializing transistor T4 is connected to the first electrode C1 of the storage capacitor Cst and the drain electrode D3 of the compensating transistor T3 and the gate electrode G1 of the driving transistor Tl do. The initializing transistor T4 is turned on in response to the (n-1) th scanning signal Sn-1 transmitted through the second scanning line 24 to supply the initializing voltage Vint to the gate electrode G1 of the driving transistor Tl. To initialize the voltage of the gate electrode G1 of the driving transistor T1.

The gate electrode G5 of the first emission control transistor T5 is connected to the light emission line 15. [ The first emission control transistor T5 may be connected between the power supply line 26 and the driving transistor Tl. The source electrode S5 of the first emission control transistor T5 is connected to the power supply line 26. [ The drain electrode D5 of the first emission control transistor T5 is connected to the source electrode S1 of the driving transistor T1 and the drain electrode D2 of the switching transistor T2. As the emission control signal En is applied to the gate electrode G5 of the first emission control transistor T5, the first emission control transistor T5 is turned on and the driving current Id is supplied to the organic light emitting element OLED Flows. The first emission control transistor T5 can determine the timing at which the driving current Id flows through the organic light emitting diode OLED.

And the gate electrode G6 of the second emission control transistor T6 is connected to the light emission line 15. [ The second emission control transistor T6 may be connected between the driving transistor Tl and the organic light emitting diode OLED. The source electrode S6 of the second emission control transistor T6 is connected to the drain electrode D1 of the driving transistor T1 and the source electrode S3 of the compensation transistor T3. The drain electrode D6 of the second emission control transistor T6 is electrically connected to the anode of the organic light emitting diode OLED. The first emission control transistor T5 and the second emission control transistor T6 are turned on according to the emission control signal En received through the emission line 15. [ The second emission control transistor T6 is turned on as the emission control signal En is applied to the gate electrode G6 of the second emission control transistor T6 so that the driving current Id is applied to the organic emission element OLED Flows. The second emission control transistor T6 can determine the timing at which the driving current Id flows through the organic light emitting element OLED.

And the gate electrode G7 of the bypass transistor T7 is connected to the third scanning line 34. [ The source electrode S7 of the bypass transistor T7 is connected to the anode of the organic light emitting element OLED. The drain electrode D7 of the bypass transistor T7 is connected to the initialization line 22. The bypass transistor T7 is turned on according to the (n + 1) th scan signal Sn + 1 transmitted through the third scan line 34 to initialize the anode of the organic light emitting diode OLED.

The second electrode (C2) of the storage capacitor (Cst) is connected to the power supply line (26). The first electrode C1 of the storage capacitor Cst is connected to the gate electrode G1 of the driving transistor T1, the drain electrode D3 of the compensating transistor T3 and the source electrode S4 of the initializing transistor T4 do.

The cathode of the organic light emitting diode OLED receives the reference voltage ELVSS. The organic light emitting diode OLED emits light by receiving the driving current Id from the driving transistor Tl.

In another embodiment of the present invention, the number and the connection relationship of the transistors T1 to T7 constituting the pixel PX may be variously changed.

FIG. 15 is a circuit diagram showing one photo pixel of FIG. 13 according to an embodiment of the present invention.

The photo pixel HX-1 according to an embodiment of the present invention may include photo transistors T11 and T21, a photo capacitor Cap1, and a photosensor PD-1.

The phototransistors T11 and T21 may include a first transistor T11 and a second transistor T21. In the exemplary embodiment of the present invention, each of the first and second transistors T11 and T21 is a p-type transistor. However, the present invention is not limited thereto.

The photo pixel HX-1 includes a first scan line 44 for transferring an (n + 1) th scan signal Sn + 1, a second scan line 54 for transferring an nth scan signal Sn, Line 64 as shown in FIG.

The gate terminal of the first transistor T11 is connected to the second scan line 54. [ One terminal of the first transistor T11 is connected to the anode of the photosensor PD-1 and the other terminal is connected to the sensing line 64. [

The gate terminal of the second transistor T21 is connected to the first scan line 44. One terminal receives the initialization voltage Vint and the other terminal is connected to the anode of the photosensor PD-1.

In the embodiment of Fig. 15, the lower metal layer of the photosensor PD-1 may be an anode, and the upper metal layer may be a cathode. The cathode of the photosensor PD-1 receives the power supply voltage ELVDD. One electrode and the other electrode of the photocathode Cap1 are respectively connected to the anode and the cathode of the photosensor PD-1.

The first node N1 connected to the anode of the photosensor PD-1 may be initialized to the initializing voltage Vint before the frame in which the photosensor PD-1 is driven.

The first node N1 maintains the initializing voltage Vint and the photo-capacitor Cap1 supplies the voltage between the power supply voltage ELVDD and the initializing voltage Vint when the photosensor PD- Charge the charge corresponding to the car.

Then, when light is applied to the photosensor PD-1, as the voltage of the first node N1 approaches the power supply voltage ELVDD, the charges charged in the photo-capacitor Cap1 are discharged.

When the nth scan signal Sn is applied to the second scan line 54 and the first transistor T11 is turned on, a current flows to the sensing line 64 by the charge discharged from the photocapacitor Cap1.

When the first transistor T11 is turned off and the (n + 1) th scan signal Sn + 1 is applied and the second transistor T21 is turned on, the anode of the photosensor PD- Is initialized by the voltage Vint.

16 is a circuit diagram showing one photo pixel of FIG. 13 according to another embodiment of the present invention.

The photo-pixels shown in FIG. 16 are different from the photo-pixels described with reference to FIG.

The photo pixel HX-2 may further include a third transistor T31. In the embodiment of the present invention, the third transistor T31 is illustratively a p-type transistor, but the present invention is not limited thereto.

The gate terminal of the third transistor T31 is connected to the anode of the photosensor PD-1 and one terminal receives the power supply voltage ELVDD and the other terminal is connected to one terminal of the first transistor T12 .

The third transistor T31 can increase the amount of change in the current flowing through the sensing line 64 by amplifying the voltage change of the voltage of the first node N1 by applying light to the photosensor PD-1.

17 is a circuit diagram showing one photo pixel of FIG. 13 according to another embodiment of the present invention.

The photo pixel HX-3 shown in Fig. 17 may include photo transistors T12 and T22, a photo capacitor Cap2, and a photosensor PD-2.

The phototransistors T12 and T22 may include a first transistor T12 and a second transistor T22. In the exemplary embodiment of the present invention, each of the first and second transistors T12 and T22 is a p-type transistor. However, the present invention is not limited thereto.

The photo pixel HX-3 includes a first scan line 44 for transmitting an (n + 1) th scan signal Sn + 1, a second scan line 54 for transferring an nth scan signal Sn, Line 64 as shown in FIG.

The gate terminal of the first transistor T12 is connected to the second scan line 54. [ One terminal of the first transistor T12 is connected to the cathode of the photo sensor PD-2 and the other terminal is connected to the sensing line 64. [

The gate terminal of the second transistor T22 is connected to the first scan line 44. One terminal receives the power supply voltage ELVDD and the other terminal is connected to the cathode of the photosensor PD-2.

In the embodiment of Fig. 17, the lower metal layer of the photosensor PD-2 is a cathode, and the upper metal layer may be an anode. The anode of the photosensor PD-2 receives the initialization voltage Vint. One electrode and the other electrode of the photocathode Cap2 are connected to the anode and the cathode of the photosensor PD-2, respectively.

The second node N2 connected to the cathode of the photosensor PD-2 is charged with the power source voltage ELVDD before the frame in which the photosensor PD-1 is driven.

The second node N2 maintains the power supply voltage ELVDD and the photocapacitor Cap2 maintains the voltage between the power supply voltage ELVDD and the initialization voltage Vint when light is not applied to the photosensor PD- Charge the charge corresponding to the car.

Then, when light is applied to the photosensor PD-2, the voltage of the second node N2 becomes close to the initializing voltage Vint.

When the nth scan signal Sn is applied to the second scan line 54 and the first transistor T12 is turned on, a current flows through the sensing line 64 due to the voltage of the second node N2. When light is incident on the photosensor PD-2, the amount of current flowing to the sensing line 64 can be reduced.

When the first transistor T12 is turned off and the (n + 1) th scan signal Sn + 1 is applied and the second transistor T22 is turned on, the cathode of the photosensor PD- And is charged with the voltage ELVDD.

FIG. 18 is a circuit diagram showing one photo pixel of FIG. 13 according to another embodiment of the present invention.

The photodiode shown in FIG. 18 differs from the photodiode described with reference to FIG. 17 in the third transistor and will be mainly described.

The photo pixel HX-4 may further include a third transistor T32. In the embodiment of the present invention, the third transistor T32 is a p-type transistor, but it is not limited thereto.

The gate terminal of the third transistor T32 is connected to the cathode of the photosensor PD-2 and one terminal may receive the power supply voltage ELVDD and the other terminal may be connected to one terminal of the first transistor 12 .

The third transistor T32 can increase the amount of change in the current flowing through the sensing line 64 by amplifying the voltage change of the voltage of the second node N2 by applying light to the photosensor PD-2.

FIG. 19 is a circuit diagram showing one pixel of FIG. 13 according to another embodiment of the present invention.

The photo pixel HX-5 shown in FIG. 19 includes the phototransistors T13, T23, T33, T43 and T53, the first photocapacitor Cap3, the second photocapacitor Cap4, ).

The phototransistor may include first through fifth transistors T13, T23, T33, T43, and T53. Although each of the first through fifth transistors T13, T23, T33, T43, and T53 is a p-type transistor in the exemplary embodiment of the present invention, the present invention is not limited thereto.

The photo pixel HX-5 includes a first scan line 44 for transferring an (n + 1) th scan signal Sn + 1, a second scan line 54 for transferring an nth scan signal Sn, Line 64 as shown in FIG.

The gate terminal of the first transistor T13 is connected to the cathode of the photosensor PD-3. One terminal of the first transistor T13 is connected to the other terminal of the fifth transistor T53 and the other terminal of the first transistor T13 is connected to one terminal of the second transistor T23.

The gate terminal of the second transistor T23 is connected to the second scan line 54. [ One terminal of the second transistor T23 is connected to the other terminal of the first transistor T13 and the other terminal of the second transistor T23 is connected to the sensing line 64. [

The gate terminal of the third transistor T33 is connected to the first scan line 44. One terminal of the third transistor T33 is connected to one electrode of the second photo-capacitor Cap4 and the cathode of the photosensor PD-5, And is connected to one terminal of the first transistor T13.

The gate terminal of the fourth transistor T43 is connected to the first scan line 44. One terminal receives the power source voltage ELVDD and the other terminal is connected to one terminal of the second transistor T23.

The gate terminal of the fifth transistor T53 is connected to the second scan line 54. One terminal receives the power supply voltage ELVDD and the other terminal is connected to one terminal of the first transistor T13.

One electrode of the first photocathode Cap1 is connected to the first scan line 44 and the other electrode is connected to the cathode of the photosensor PD-3.

One electrode and the other electrode of the second photocathode Cap2 are connected to the anode and the cathode of the photosensor PD-3, respectively.

FIG. 20 is a waveform diagram of a signal applied to FIG. 19, and FIGS. 21A to 21C are diagrams for explaining a driving mechanism of a photo-pixel per section.

Referring to FIGS. 20 and 21A, the second transistor T23 and the fifth transistor T53 are turned on during the first period PR1 during which the nth scan signal Sn is activated.

The gate voltage of the first transistor T13 is lowered by the photosensor PD-3 if the light is applied to the photosensor PD-3 before the first period PR1, The current Rn flows through the sensing line 64 during the first period PR1.

Referring to FIGS. 20 and 21B, the third transistor T33 and the fourth transistor T43 are turned on during the second period PR2 in which the (n + 1) th scan signal Sn + 1 is activated. The power source voltage ELVDD is transferred to the gate terminal of the first transistor T13 through a path that sequentially passes through the fourth transistor T43, the first transistor T13 and the third transistor T33, The first transistor T13 is turned off as the gate terminal voltage of the transistor T13 increases. The voltage for compensating the threshold voltage of the first transistor T13 is stored in the gate terminal of the first transistor T13 as the first transistor T13 is turned off during the second period PR2.

20 and 21C, the photosensor PD-3 receives light during the third period PR3 until the n-th scan signal Sn is activated again. When light is applied to the photosensor PD-3 during the third period PR3, the voltage of the gate terminal of the first transistor T13 becomes close to the initialization voltage Vint.

According to the embodiment of the present invention, by adding the operation of compensating the threshold voltage of the first transistor T13 using signals (nth scan signal and n + 1th scan signal) for driving the pixels, It is possible to solve the problem of non-uniformity of sensing sensitivity due to the dispersion of the threshold voltage of the transistor T13.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and changes may be made thereto without departing from the scope of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1000: display device 100: substrate
200: driving layer 300: display element layer
400: sealing layer DP: display panel
PX: Pixel HX: Photo pixel

Claims (21)

Board;
And first driving circuit groups disposed on the substrate, each first driving circuit group including N first pixel driving circuits and photo pixels, wherein N is a natural number, each of the photo pixels includes a photo- A drive layer including a photosensor electrically connected to the circuit;
And a display element layer disposed on the driving layer and including first display element groups including N first display elements each electrically connected to each of the N first pixel drive circuits,
The minimum distances between the first color display elements of the plurality of first display elements measured in the first specific direction on the plane are substantially the same,
The distance between the two first pixel drive circuits adjacent to each other in the second specific direction across the photo pixel in the plane is different from the distance between the two first pixel drive circuits continuously arranged in the second specific direction Display device. The method according to claim 1,
Wherein the driving layer further comprises second driving circuit groups each including the N second pixel driving circuits,
Wherein the display element layer further comprises second display element groups each including N second display elements electrically connected to each of the N second pixel drive circuits,
The minimum distances between the first color display elements of the plurality of second display elements measured in the first specific direction on the plane are substantially the same,
Wherein distances between two adjacent second pixel-drive circuits measured in the second specific direction on a plane are substantially the same. 3. The method of claim 2,
A display area in which an image is displayed and a non-display area adjacent to the display area are defined in the display device,
Wherein the display area includes a normal display area and a light sensing area that senses a user's input using incident light,
Wherein the first driving pixel groups and the first display element groups are arranged in the light sensing area on a plane,
And the second driving pixel groups and the second display element groups are arranged in the normal display region on a plane. The method of claim 3,
The areas occupied by each of the first driving pixel groups and the second driving pixel groups are substantially equal to each other,
Wherein each of the first display element groups and the second display element groups occupies substantially the same area. The method of claim 3,
Wherein an area occupied by each of the first pixel driving circuits is smaller than an area occupied by each of the second pixel driving circuits. The method of claim 3,
A first driving circuit group of the first driving circuit groups and a second driving circuit group of the second driving circuit groups adjacent to the first driving circuit group in the first direction are spaced apart from each other to indicate a blank area Device. The method according to claim 6,
The distance between the first pixel driving circuit of the first driving circuit group and the second pixel driving circuit of the second driving circuit group adjacent to each other in the first direction is included in each of the first driving circuit groups, Wherein the distance between the two first pixel driving circuits adjacent to each other in the first direction and the distance between the two second pixel driving circuits included in each of the second driving circuit groups and adjacent to each other in the first direction. The method according to claim 6,
Wherein the driving layer further comprises signal lines,
Wherein some of the signal lines have a bent shape in the blank region. 9. The method of claim 8,
Wherein some of the signal lines are branched in the blank region and electrically connected to the first pixel driving circuits and the photo driving circuit. The method according to claim 1,
The photo-
A lower metal layer disposed on the substrate;
An active layer disposed on the lower metal layer;
An upper metal layer disposed on the active layer and having an opening exposing a part of the active layer;
An absorption filter disposed on the upper metal layer and covering the opening; And
And an interference filter disposed on the upper metal layer and covering the opening. The method according to claim 1,
Wherein the display element layer
A pixel defining layer overlapping with the photosensor; And
Further comprising a lens formed on the pixel defining layer, the pixel defining layer being overlapped with the photosensor and made of the same material as the pixel defining layer. The method according to claim 1,
A display area in which an image is displayed and a non-display area adjacent to the display area are defined in the display device,
Wherein the non-display area includes a first bending area defined outside the one side of the display area in the first direction, a first pad area defined outside the first bending area in the first direction, A second bending region defined outside the other side of the display region, and a second pad region defined outside the second bending region in the first direction,
Wherein the substrate is bent along a bending axis extending in a second direction intersecting the first direction within the first and second bending regions,
A first driving circuit chip which provides a signal to the first pixel driving circuits and the photo driving circuit and is disposed in the first pad area; And
And a second driving circuit chip which receives a signal sensed by the photo pixel and is arranged in the second pad region. 13. The method of claim 12,
And a flexible printed circuit board connecting the first pad area and the second pad area of the display device to each other. Board;
And first driving circuit groups disposed on the substrate and each including a plurality of first pixel driving circuits and photo pixels and second driving circuit groups each including a plurality of second pixel driving circuits A driving layer;
And a display element layer disposed on the driving layer and including a plurality of display elements electrically connected to the first pixel driving circuits and the second pixel driving furnaces,
The minimum distances between the first color display elements of the plurality of display elements measured in the first specific direction on the plane are substantially the same,
Wherein the first driving circuit group of the first driving circuit groups and the second driving circuit group of the second driving circuit groups adjacent to the first driving circuit group in the first direction are spaced apart from each other. 15. The method of claim 14,
The distance between the first pixel driving circuit of the first driving circuit group and the second pixel driving circuit of the second driving circuit group adjacent to each other in the first direction is included in each of the first driving circuit groups, Wherein the distance between the two first pixel driving circuits adjacent to each other in the first direction and the distance between the two second pixel driving circuits included in each of the second driving circuit groups and adjacent to each other in the first direction. A first scan line for receiving a first scan signal;
A second scan line for receiving a second scan signal different from the first scan signal;
A sensing line insulated from the first and second scan signals;
A display element for receiving the first and second scan signals from the first and second scan signals and emitting light; And
The first and second scan signals from the first and second scan signals; and a photo-transistor that receives the first and second scan signals from the first and second scan signals and provides current to the sensing line based on the light reflected by the user, . 17. The method of claim 16,
The photo-
A photosensor having a cathode and an anode for receiving a power supply voltage;
A first transistor including a gate terminal coupled to the second scan line, a terminal coupled to the anode of the photosensor, and another terminal coupled to the sensing line; And
And a second transistor including a gate terminal connected to the first scan line, a terminal for receiving an initialization voltage lower than the power supply voltage, and another terminal connected to the anode of the photosensor. 17. The method of claim 16,
The photo-
A photosensor having a cathode and an anode for receiving a power supply voltage;
A first transistor including a gate terminal connected to the second scan line, a terminal, and another terminal connected to the sensing line;
A second transistor including a gate terminal connected to the first scan line, a terminal receiving an initialization voltage lower than the power supply voltage, and another terminal connected to the anode of the photosensor; And
A gate terminal connected to the anode of the photosensor, a terminal receiving the power supply voltage, and a third transistor coupled to the one terminal of the first transistor. 17. The method of claim 16,
The photo-
A photosensor having an anode and a cathode for receiving an initialization voltage;
A first transistor including a gate terminal coupled to the second scan line, a terminal coupled to the cathode of the photosensor, and another terminal coupled to the sensing line; And
A second transistor including a gate terminal connected to the first scan line, a terminal receiving a power supply voltage higher than the initialization voltage, and another terminal connected to the cathode of the photosensor. 17. The method of claim 16,
The photo-
A photosensor having an anode and a cathode for receiving an initialization voltage;
A first transistor including a gate terminal connected to the second scan line, a terminal, and another terminal connected to the sensing line;
A second transistor including a gate terminal connected to the first scan line, a terminal receiving a power supply voltage higher than the initialization voltage, and another terminal connected to the cathode of the photosensor; And
A gate terminal connected to the cathode of the photosensor, a terminal for receiving the power supply voltage, and another terminal connected to the one terminal of the first transistor. 17. The method of claim 16,
The photo-
A photosensor having an anode and a cathode for receiving an initialization voltage;
A first transistor including a gate terminal connected to the cathode of the photosensor, a terminal, and another terminal;
A second transistor including a gate terminal coupled to the second scan line, a terminal coupled to the other terminal of the first transistor, and another terminal coupled to the sensing line;
A third transistor including a gate terminal coupled to the first scan line, a terminal coupled to the cathode of the photosensor, and another terminal coupled to the one terminal of the first transistor;
A fourth transistor including a gate terminal connected to the first scan line, a terminal for receiving a power supply voltage higher than the initialization voltage, and another terminal connected to the one terminal of the second transistor; And
And a fifth transistor including a gate terminal connected to the second scan line, a terminal for receiving the power supply voltage, and another terminal connected to the one terminal of the first transistor.

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